Sabah has $450 to pay for college textbooks. She expects to pay about $75 per book. Her friend told her that 4 of them can be ch
ecked out of the library for free. Complete the equation below to find the total number of books that Sabah can get for her classes. Use b to represent the total books.
The equation has to look like this format: ?(?-?)=?
You can use any of these numbers to fill in the equation: 4, 10, 75, 300, 450, b
B is the number of books. She does not have to pay for 4 books, so the number of books she will pay for is b - 4. Each book costs $75, so b - 4 books cost 75(b - 4).
